Well the most basic setup would be
FNG
Starter genin
350 genin (the ones unlocked after battle arena)
Akatsuki jounin
second akatsuki jounin
Chiyo / Ebizou / Orochimaru kage
Gobi summon one of, if not the best summon in the game

With that said there's no best fn, they're all balanced out, so my suggestion would be
go with your favorite ones.